------------------------------SUllxm.i1lteci either as an amended dllaim or as a new olJa:im. (7) The deletion of any clalim pl"e'Yiously .aippeIlll"ing in fue applti.cationshall be made by 'indiloating the number of tlhe ~ Vi.ous clalm foUQWed by the word "oan-cell1ed". 297 12. Fl:ow Sheets and diagTrams are considered rt:o be drawings. 13. (1) Th.e 3lbstmct 'Shafl be ,so dralfted tjhat.it ~n efficl'en~­ ly serve as a scanning tool for purposes of searebllng m th~ parti­ cu'har art. (2) The abswact shall oonsist of the following, (a) a summary of tJhe disclosure a:s contailned in the des­ cri'ptJion, itJhe oLaims, and any drawings, indi~aJting the tedhn'ical field to wMoh the invention pertains and drlaf­ ted in a way whdCib a1J1ows the dear undemtandling of the Itechnical 'Prob'lem, the gist of the solution O'f tba-t problem through the invention ami tJhe principa'l UISe or uses of the invention; and (b) where ,appLicable, tlhe chemical formuLa whlich, amoog al11Jhe fOrnl,w'ae conlta:ined 'in 1!he apphlcation, best oha­ racterises the invention. (3) The a1bstrnct shall be as concise a:s tile w'sciosure pel'­ mi ts, prefef1ably 50 to 150 words. (4) The ,abstJf1act shal'l n{)t containsta<tements on the aHeged meI1i1ls or value ,of the invention or on its sp.ocula'tive appLication. (5) EJach ma:in technical feature mentioned in 'the abstract and Hlustrated by ,a drawing ,in the appHcaition shall be followed by a reference sign, placed between parentheses. (6) The abstract ,shaH be ,accompanied by the most illu­ st.ratdve 'of any dr:awings furnilshed by the applicant. 14. (1) Units of weights and measures shall be expressed in the metI;'i'csy'stem. (2) Temperaltures ;shall be expressed in degrees centigrade (Cel:sius) . (3) Densilty shall be ex;pressed in metric units, (4) For indications 00 heat, ene'rgy, ~ight, sound and mag­ netism, as well as fOir ma1tJhematical formulae and electrical units rules in general use ,shall be observed. ' (5) For chemical formu1a:e,tJhe symools, altomic weights and molecular formulae in general use ,shaH be employed. (6) In general, only suoh techntioal terms, signs and symbols shall be used aJS are generaHy accepted in the art. (7) The terminology and the signs shall be oons<i.steIllt throughout the applicati<on. 15. (1 ~ Subject to regulaltion 19 (7), the applicatJi{)n and any aocompanY'mgSltatements or documents shall be rued in three Numbar at ~ies, but ~he Regilstrar may require the applicant to supply ad­ oopjes and pb.y&Ical r&­ ditional COpIes. quir~